Sometimes it is hard to be mustachian as a college student. But textbooks are still a place I see a lot of people overspend. Now my books for this semester were actually very cheap (also have a class that doesn't currently list a book), but I still saved 50+%
I just found out all the books I needed for the first semester so I thought I'd get a head start on ordering them. Slugbooks.com is my awesome helper. Seriously, use that if you have the need. It compares amazon, abebooks, and more. It also compare buying new, used, renting, and digital copies of books.
My notecard as pictures below shows my savings. The left column is what the bookstore prices were for new books/study guides. The right is what I paid (ended up Amazon had all the best deals). The two prices in parenthesis I didn't find online, it's a study guide and a workbook I believe. I'll continue looking and if worse comes to worse, fork over the also relatively cheap price on those to the bookstore.